EC_SkyX: Add operator bool to EC_SkyXImpl so that instead of e.g. "if (impl && impl->skyX)" we can just write "if (impl)". Also, restore the original Ogre scene manager ambient color when EC_SkyX is deleted.
EC_SkyX: Add operator bool to EC_SkyXImpl so that instead of e.g. "if (impl && impl->skyX)" we can just write "if (impl)". Also, restore the original Ogre scene manager ambient color when EC_SkyX is deleted.

AlphaStaxLLC/tundra,BogusCurry/tundra,jesterKing/naali,AlphaStaxLLC/tundra,jesterKing/naali,realXtend/tundra,jesterKing/naali,jesterKing/naali,jesterKing/naali,realXtend/tundra,realXtend/tundra,AlphaStaxLLC/tundra,pharos3d/tundra,pharos3d/tundra,AlphaStaxLLC/tundra,BogusCurry/tundra,AlphaStaxLLC/tundra,pharos3d/tundra,BogusCurry/tundra,pharos3d/tundra,AlphaStaxLLC/tundra,realXtend/tundra,BogusCurry/tundra,jesterKing/naali,realXtend/tundra,realXtend/tundra,pharos3d/tundra,pharos3d/tundra,jesterKing/naali,BogusCurry/tundra,BogusCurry/tundra